Liquid Crystal Display Common Voltage Routing via Guide Frame
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Solution Overview
Problem
In liquid crystal displays, the difference in resistance between feedback and supply lines for common voltage compensation circuits leads to voltage level inconsistencies, increasing device complexity and cost due to the need for additional components like gate printed circuit boards.
Innovation Solution
A liquid crystal display design that reduces the length of lines connecting the common voltage supply circuit to the common voltage line on the lower substrate, using a mesh structure for the common voltage line and eliminating the need for a gate printed circuit board by routing lines through the guide frame and bottom cover, thereby minimizing resistance differences and costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the common voltage supply lines are routed through the gate circuit films to reach the lower substrate, then the common voltage can be supplied to the display panel, but the line length increases causing resistance differences and voltage level inconsistencies
Solution Approach 1:
The patent utilizes the three-dimensional space within the display panel by routing the common voltage supply lines through the guide frame and bottom cover, which are structural components in the Z-dimension (depth), rather than routing them only through the planar gate circuit films. This spatial reconfiguration shortens the effective path length and reduces resistance while maintaining electrical connectivity.
Solution Approach 2:
The guide frame and bottom cover serve as intermediary structures that facilitate the routing of common voltage supply lines. These components act as conduits or pathways, enabling the lines to reach the lower substrate more efficiently without passing through the entire gate circuit film area, thereby reducing resistance and voltage drop.
2Reliability
If additional components like gate printed circuit boards are added to compensate for resistance differences, then voltage level consistency can be maintained, but device complexity and cost increase
Solution Approach 1:
The patent merges the common voltage supply function with the existing guide frame and bottom cover structures. Instead of adding separate compensation components like gate printed circuit boards, the design integrates the voltage supply pathways into the structural framework already present in the display panel, thereby maintaining reliability without increasing device complexity.
Solution Approach 2:
The guide frame and bottom cover, which are structural components necessary for panel assembly, are utilized to also serve as conduits for electrical connections. This self-service approach allows the existing structures to perform dual functions (mechanical support and electrical routing), eliminating the need for additional dedicated compensation components.
3Reliability
If additional components like gate printed circuit boards are added to compensate for resistance differences, then voltage level consistency can be maintained, but manufacturing cost increases
Solution Approach 1:
The patent combines the electrical routing function with existing structural components (guide frame and bottom cover), eliminating the need for separate gate printed circuit boards. This integration reduces the total component count and assembly steps, thereby lowering manufacturing costs while maintaining voltage consistency.
Solution Approach 2:
The guide frame and bottom cover are designed to serve multiple functions: providing mechanical support, enabling panel assembly, and facilitating electrical connections for common voltage supply. This multi-functionality reduces the need for dedicated components, simplifying manufacturing and reducing costs.
Data Source
AI summary
A display device includes a display panel including a first substrate and a second substrate; a source driver flexible film attached to the second substrate; a source driver circuit attached to the source driver flexible film; a common voltage line connected to the source driver circuit; common voltage compensation circuits connected to the common voltage line; and common voltage supply lines and common voltage feedback lines connecting the common voltage line and the common voltage compensation circuits, respectively, wherein the common voltage compensation circuits include a circuit line extending at a rear of the display panel connecting to a connection terminal on the source driver circuit.