Liquid Crystal Display Bezel Reduction via Segmented Common Voltage Supply
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Solution Overview
Problem
As liquid crystal display panels increase in size, the width of the common voltage supply unit and sealing member must be increased to maintain reliability and load-bearing capacity, leading to a wider bezel area, which compromises image quality and bonding force.
Innovation Solution
A novel alignment structure for the sealing member and common voltage supply unit is implemented, reducing the line resistance of the common voltage supply unit and the width of the bezel area, while maintaining bonding force through a patterned common electrode structure and optimized aperture ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the width of the common voltage supply unit is increased to bear the load of large-size liquid crystal panels, then the load-bearing capacity is improved, but the width of the bezel area is increased
Solution Approach 1:
The common voltage supply unit is divided into multiple segments arranged in parallel. Each segment carries a portion of the total load, allowing the overall load-bearing capacity to be increased without requiring a proportional increase in the width of a single supply line. This segmentation enables the bezel width to be reduced while maintaining sufficient current carrying capacity.
Solution Approach 2:
Instead of increasing the width (one dimension) of the common voltage supply unit to handle larger loads, the patent utilizes the vertical dimension by stacking multiple supply units in parallel. This dimensional transition allows load-bearing capacity to be scaled without proportionally increasing the horizontal bezel width.
2Reliability
If the width of the sealing member is increased to maintain bonding force for large-size panels, then the bonding reliability is improved, but the width of the bezel area is increased
Solution Approach 1:
The sealing member is divided into multiple segments that are distributed across the panel perimeter. This segmentation allows the bonding function to be distributed across multiple locations rather than requiring a single wide sealing member, thereby maintaining total bonding force while reducing the width of individual sealing regions and the overall bezel.
3Length of stationary object
If the width of the common voltage supply unit is reduced to decrease the bezel area, then the width of the bezel area is reduced, but the line resistance is increased
Solution Approach 1:
Multiple narrow common voltage supply units are arranged in parallel to replace a single wide supply unit. The parallel configuration reduces the width of each individual supply line (thereby reducing bezel width) while maintaining low total resistance through the parallel paths for current flow.
Solution Approach 2:
Multiple parallel common voltage supply units are electrically combined to function as a unified low-resistance pathway. The combined parallel structure achieves the same current carrying capacity and resistance characteristics as a single wide supply unit would provide, but with reduced individual line widths that minimize bezel area.
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
Provided is a liquid crystal display apparatus (100). The liquid crystal display apparatus (100) includes: a pixel area (AA) including a pixel array (210) disposed on a first substrate (124); a peripheral area (PA) including a gate driver (222) disposed outside the pixel array (210) and a common voltage supply unit (230) including openings (OP) disposed outside the gate driver (222); an overcoating layer (248) disposed on the pixel array (210) and the gate driver (222); a pixel electrode (234) disposed on the overcoating layer (248) and connected to the pixel array (210); a common electrode structure (232) disposed on the overcoating layer (248), overlapped with the pixel electrode (234), and electrically connected to the common voltage supply unit (230); and a sealing member (128) surrounding a liquid crystal layer (126) disposed between the first substrate (124) and a second substrate (134) facing the first substrate, supporting the first substrate and the second substrate (124), and overlapped with the openings (OP).