Line-on-glass LCD Common Voltage Distribution via Dummy Channels
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Solution Overview
Problem
The existing line-on-glass type liquid crystal display devices suffer from picture quality deterioration due to insufficient common voltage supply, leading to issues like cross-talk and a greenish color, caused by the small area of silver dots used for common voltage distribution on the color filter array substrate.
Innovation Solution
The implementation of a data drive integrated circuit with both effective and dummy output channels, where the channel selecting part allows for selective supply of data voltage and common voltage to the dummy channels, effectively increasing the area of common voltage distribution across the liquid crystal display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silver dots are used for common voltage distribution on the color filter array substrate, then common voltage can be supplied to the liquid crystal display panel, but the small area of silver dots causes insufficient common voltage supply leading to picture quality deterioration
Solution Approach 1:
The patent segments the common voltage distribution function by dividing it between two separate conductive structures: silver dots (existing structure) and dummy data lines (new structure). The dummy data lines are positioned at both ends of the liquid crystal display panel and are electrically connected to the common electrode, creating additional pathways for common voltage distribution. This segmentation allows the system to maintain reliable common voltage supply while effectively increasing the total area coverage for voltage distribution.
Solution Approach 2:
The patent extends the common voltage distribution from a two-dimensional point-based structure (silver dots) to a one-dimensional line-based structure (dummy data lines). By transforming the distribution geometry from discrete points to continuous lines that run along the edges of the panel, the system dramatically increases the effective distribution area and improves voltage uniformity across the display.
2Length of moving object
If the liquid crystal display device uses a thin design with removed gate PCB, then the device becomes thinner, but picture quality deterioration occurs due to insufficient common voltage supply
Solution Approach 1:
The patent implements a self-service mechanism where the dummy data lines, which are part of the existing data drive circuitry, automatically serve a dual function: transmitting data signals during normal operation and providing common voltage distribution during the refresh period. This eliminates the need for separate dedicated common voltage supply structures, allowing the thin design to maintain both compact form factor and reliable picture quality.
Solution Approach 2:
The dummy data lines are designed with multi-functionality, serving both as data signal transmission pathways and as common voltage distribution lines. By making these existing structures universal, the patent avoids adding separate dedicated components that would increase device thickness, thereby maintaining the thin design while ensuring sufficient common voltage supply for picture quality.
3Area of stationary object
If dummy output channels are used for common voltage supply, then common voltage distribution area is increased, but device complexity increases due to channel selecting part
Solution Approach 1:
The patent employs periodic action by utilizing the dummy data lines during specific time intervals (refresh periods) when they are switched to provide common voltage. The channel selecting part alternates between connecting data lines and dummy data lines to their respective destinations in a periodic manner, allowing the same physical infrastructure to serve multiple functions at different times without requiring permanent dual-path routing.
Solution Approach 2:
The patent introduces dynamic switching capability through the channel selecting part, which dynamically reconfigures the connections between output channels and target lines based on operational requirements. This dynamic reconfiguration allows dummy data lines to be used for common voltage supply only when needed, rather than permanently dedicating them, thereby minimizing the impact on device complexity while maximizing common voltage distribution area.
Data Source
AI summary
A line-on-glass type liquid crystal display device, which includes a gate drive integrated circuit mounted on a liquid crystal display panel for supplying a gate signal to the liquid crystal display panel, and a data drive integrated circuit for supplying a data voltage to the liquid crystal display panel. Further, the data drive integrated circuit includes an output circuit having effective output channels to which the data voltage is supplied and dummy output channels to which at least any one of the data voltage and a common voltage is supplied. Also included is a channel selecting part for selectively supplying any one of the data voltage and the common voltage to at least anyone of the dummy output channels.