Liquid Crystal Display Panel Signal Screening for OLB Yield
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Solution Overview
Problem
As the resolution of liquid crystal display panels increases, the number of input terminals also increases, leading to a reduced line width of peripheral circuits, which complicates outer lead bonding (OLB) processes and lowers product yield.
Innovation Solution
The design includes a liquid crystal display panel with a color film substrate and an array substrate, featuring a grid structure of crisscrossed scan and data lines, where each input terminal is connected to at least two data lines with independent signal screening units to select alternating current signals, reducing the number of input terminals and preventing short circuits, and allowing for a wider line width of peripheral circuits, thus simplifying OLB and enhancing bonding strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the resolution of the panel is increased, then the display quality is improved, but the number of input terminals increases, resulting in reduced line width of peripheral circuits and lowered product yield
Solution Approach 1:
Multiple data lines (first data line, second data line, etc.) are connected to a single input terminal through signal screening units. This merging approach reduces the number of input terminals required, thereby maintaining adequate line widths for peripheral circuits while supporting high-resolution displays with increased data line count.
Solution Approach 2:
Signal screening units are introduced as intermediary components between input terminals and data lines. These screening units enable one input terminal to control multiple data lines by selecting appropriate signals, thus reducing the total number of input terminals needed without compromising the ability to drive high-resolution panels.
2Adaptability or versatility
If the number of input terminals is increased, then the data line connectivity is improved, but the line width of peripheral circuits is reduced, complicating OLB processes
Solution Approach 1:
The patent merges multiple data line connections through a single input terminal using signal screening units. This consolidation reduces the number of separate input terminals and their corresponding peripheral circuit lines, making OLB processes easier by maintaining adequate line widths that are not overly constrained by the number of connections.
Solution Approach 2:
Each input terminal is designed to serve multiple data lines through the signal screening units, making the input terminal universal. This multi-functionality allows a single input terminal to connect to and control multiple data lines, reducing the overall number of input terminals and simplifying the peripheral circuit layout for OLB processes.
3Measurement precision
If the line width of peripheral circuits is reduced, then the panel resolution can be increased, but the bonding strength of flip chip films is reduced
Solution Approach 1:
By merging multiple data line signals through a single input terminal using signal screening units, the patent reduces the total number of peripheral circuit lines required. This allows the remaining peripheral circuit lines to maintain adequate widths that ensure sufficient bonding strength for flip chip films, even in high-resolution panels.
Solution Approach 2:
The patent changes the signaling approach by using alternating current signals with positive and negative voltage phases controlled through signal screening units. This parameter change allows efficient data line control with fewer input terminals, thereby maintaining adequate line widths and bonding strength while supporting high panel resolution.
Data Source
AI summary
The present invention provides a liquid crystal display panel including a color film substrate and an array substrate, and a plurality of input terminals, a scan line, and a data line. Wherein each of the input terminals is respectively connected to at least two data lines, a signal screening unit in series between at least part of the data lines and the corresponding input terminal. The input terminal is connected to an alternating current signal, and the signal screening unit is used for screening the alternating current signal to select a positive voltage signal or a negative voltage signal to the data lines.