Narrow Bezel LCD Panel Using Bent Flexible Substrate
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Solution Overview
Problem
Existing liquid crystal display (LCD) panels face challenges in achieving a narrow bezel due to the outer lead bonding (OLB) region, which complicates the reduction of the non-display area and affects the screen-to-body ratio.
Innovation Solution
The implementation of a flexible second substrate with bent extended portions and a sealing portion that reduces the non-display region by sandwiching the liquid crystal layer between two substrates, with spacers maintaining distance and support, allowing for a more compact design and increased screen-to-body ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional LCD panel structure with OLB region is used, then the manufacturing process is simplified, but the bezel width cannot be reduced and screen-to-body ratio is limited
Solution Approach 1:
The patent extracts the lead bonding function from the traditional OLB region and relocates it to the flexible substrate side through COF integration. This removes the constraint that the rigid substrate must have a large non-display region for lead bonding, thereby enabling bezel reduction while maintaining manufacturing feasibility
Solution Approach 2:
The patent transitions from a planar rigid substrate structure to a three-dimensional flexible substrate structure that can be bent and folded. This dimensional change allows the lead bonding region to be positioned in a different spatial plane, eliminating the need for a large non-display area on the front surface and enabling narrow bezel design
2Area of stationary object
If the non-display region is reduced to achieve narrow bezel, then screen-to-body ratio is improved, but the OLB region becomes difficult to accommodate
Solution Approach 1:
The patent employs a flexible substrate made of thin film material that can be bent and folded. This flexibility allows the substrate to accommodate the COF and lead bonding structures in a compact, folded configuration rather than requiring a large planar non-display region, thus enabling narrow bezel while maintaining manufacturability
Solution Approach 2:
The patent integrates the COF and lead bonding structures within the flexible substrate's folded configuration, nesting these functional elements in a compact manner. This nesting approach allows all necessary manufacturing features to be contained within a small non-display area, achieving narrow bezel without compromising manufacturing capability
Data Source
AI summary
An LCD display panel with increased screen-to-body ratio includes first and second substrates with a liquid crystal layer disposed between them. The first substrate includes a display portion and at least two edge portions. The second substrate includes a support portion, two extended portions, and a second extended portion. A size of the support portion is same as a size of the display portion. Each first extended portion corresponds to one edge portion. The second extended portion is extended from a side of the support portion and is bent away from the first substrate. Part of the second extended portion is disposed below the display portion, and the electronic elements to drive the display are disposed on surface of the second extended portion.