Liquid Crystal Panel Narrow Frame via Common Electrode Routing
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Solution Overview
Problem
The reduction of frame size in liquid crystal panels is limited due to the presence of common lines that surround the array substrate and occupy significant space, as they are necessary for providing a reference potential to the common electrode.
Innovation Solution
A liquid crystal panel design that eliminates the need for common lines by using a color filter substrate with a common electrode that completely covers a black matrix, where first and second metal lines connect the signal sources to the common electrode, replacing the common lines and allowing for a narrower frame width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If common lines are used to surround the array substrate and connect to the common electrode, then the common electrode can receive reference potential, but the frame width increases
Solution Approach 1:
The patent transitions from planar routing of common lines to three-dimensional routing by placing metal lines on the color filter substrate beneath the liquid crystal layer. This vertical dimension utilization allows signal transmission without occupying additional horizontal frame space, effectively resolving the contradiction between reliable potential supply and frame width reduction.
Solution Approach 2:
The metal lines for common electrode connection are nested within the color filter substrate structure, specifically routed in the common electrode region beneath the liquid crystal layer. This nesting approach integrates the signaling function within the existing substrate architecture, eliminating the need for external common lines and reducing frame width.
2Ease of operation
If the common line area surrounds the frame of array substrate, then the common electrode can be connected to external signal source, but the display area occupation ratio decreases
Solution Approach 1:
The patent utilizes the vertical space within the color filter substrate to route metal lines for signal connection. By placing these lines beneath the liquid crystal layer and within the common electrode region, the design achieves external signal source connection without requiring additional horizontal space that would reduce the display area occupation ratio.
3Area of stationary object
If frame size is reduced to increase screen occupation ratio, then the display area increases, but the common line routing becomes more difficult
Solution Approach 1:
The patent resolves routing complexity by transitioning to three-dimensional signal transmission within the color filter substrate. Metal lines are routed vertically beneath the liquid crystal layer in the common electrode region, eliminating the need for complex horizontal routing around the array substrate periphery and enabling frame size reduction without compromising connectivity.
Solution Approach 2:
The color filter substrate itself serves dual functions: as the structural base for the display and as the routing medium for common electrode connections. The substrate's own layers (common electrode region, liquid crystal layer) are utilized to provide the signal transmission path, eliminating the need for separate external common lines and simplifying the overall routing architecture.
Data Source
AI summary
Provided is a liquid crystal panel. The liquid crystal panel includes a glass substrate, a black matrix and a common electrode which are sequentially stacked. The common electrode completely covers the black matrix. The black matrix comprises a plurality of rows of first shading lines and a plurality of rows of second shading lines. The first shading lines and the second shading lines are perpendicular to and intersect with each other. The glass substrate is further provided with a first signal source located on one side of the black matrix and a plurality of rows of first metal lines disposed on one side facing away from the glass substrate to connect the first signal source and the first metal lines of the common electrode. The first metal lines covering the first shading lines replace common lines located outside the display area of the array substrate.