LCD Spacer Geometry for Pressure Distribution
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Solution Overview
Problem
Conventional LCD apparatuses are prone to damage and light leakage when subjected to external pressure due to relative movement between spacers and the TFT substrate, leading to rubbing and potential damage of the TFT substrate.
Innovation Solution
The LCD apparatus incorporates a first substrate with a metal layer, an insulating layer, and a first electrode layer, featuring a first indentation on the surface, and a second substrate with a spacer having a top surface that overlaps and is wider than the indentation, allowing the spacer to deform and distribute pressure, increasing lateral friction and preventing relative movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional spacers are used to maintain the interval between substrates, then the interval is maintained, but the spacers cause rubbing and damage to the TFT substrate when external force is applied
Solution Approach 1:
The spacer is designed with different width dimensions at different locations: a first width at the contact surface with the TFT substrate and a second width at the top surface, where the second width is larger than the first width. This local variation in geometry allows the spacer to provide enhanced protection at the vulnerable substrate interface while maintaining interval stability throughout its structure.
Solution Approach 2:
The indented shape of the spacer creates a cushioning effect before external force reaches the TFT substrate. When pressure is applied, the spacer's geometry allows it to deform in a controlled manner, absorbing and distributing the force before it can cause rubbing or damage to the substrate, thereby providing preventive protection.
2Reliability
If the spacer width is increased to prevent substrate damage, then substrate protection is improved, but the spacer occupies more space and may interfere with pixel structure
Solution Approach 1:
The spacer implements local quality by having different width dimensions at different locations along its height. The first width at the substrate interface provides sufficient protection without excessive occupation of pixel area, while the second width at the top surface provides additional structural stability. This localized dimension variation optimizes both protection and space utilization.
Solution Approach 2:
Instead of increasing the spacer width uniformly in two dimensions, the invention transitions to a three-dimensional solution by varying the width along the vertical dimension. The spacer width changes from the first width at the bottom to the second width at the top, utilizing the vertical dimension to provide enhanced protection without proportionally increasing the horizontal footprint that would interfere with pixel structures.
3Reliability
If the spacer deforms under external force, then pressure is distributed and substrate damage is prevented, but the spacer material must have specific mechanical properties that complicate material selection
Solution Approach 1:
The invention utilizes parameter changes in the spacer's geometric dimensions rather than relying solely on material property changes. By designing the spacer with varying width dimensions (first width and second width) and allowing controlled deformation through its indented shape, the pressure distribution capability is achieved through geometric parameters. This approach provides predictable mechanical behavior that simplifies material selection compared to requiring materials with very specific mechanical properties.
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 design effectively distributes external pressure and enhances lateral friction, preventing substrate damage and light leakage by providing a larger contact area when the spacers are pushed into the indentations, thus safeguarding the LCD apparatus from external forces.
Implementation Method 1
increasing lateral friction and preventing relative movement
Implementation Method 2
allowing the spacer to deform and distribute pressure
Data Source
Figure 1A
Figure 1B
Figure 1C~1E
AI summary
A liquid crystal display apparatus comprises a first substrate assembly (21), a second substrate assembly (22) and first spacers (23). The first substrate assembly (21) includes a transparent substrate (211), a metal layer (212), an insulating layer (214) and a first electrode layer (215). The metal layer (212) is disposed on the transparent substrate (211). The insulating layer (214) is between the metal layer (212) and the first electrode layer (215) and covers the metal layer (212). The insulating layer (214) has a first indentation (U1). A surface (216) of the first substrate assembly (21) has a second indentation (U2) formed above the first indentation (U1) and having a first width (W1). The second substrate assembly (22) is opposite to the first substrate assembly (21). The first spacers (23) are formed on the second substrate assembly (22) and each have a top surface (231) opposite to the second indentation (U2). The top surface (231) and the second indentation (U2) at least partially overlap and the top surface (231) has a second width (W2) larger than the first width (W1), so as to prevent the relative movement of the substrates when the apparatus i subjected to compression.