LCD Dummy Area Color Filter Patterns for Capacitance Reduction
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Solution Overview
Problem
In liquid crystal display (LCD) devices, the capacitance between the thin film transistor array substrate and the color filter array substrate is not uniformly maintained due to non-uniform column spacers in the dummy area, leading to a shorter distance between the substrates without a gate driving circuit, which increases capacitance and affects the output characteristic of the gate driving circuit.
Innovation Solution
The solution involves forming color filter patterns on the dummy area of the color filter array substrate opposite to column spacers, increasing the distance between the substrates, thereby reducing capacitance and enhancing the output characteristic of the gate driving circuit by maintaining a uniform cell gap.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If column spacers are formed uniformly across the dummy area to maintain consistent cell gap, then manufacturing precision is improved, but capacitance between substrates increases due to shorter distance in areas without gate driving circuit
Solution Approach 1:
The patent applies local quality by forming color filter patterns selectively only in regions opposite to column spacers within the dummy area, rather than uniformly across the entire dummy area. This localized approach allows the cell gap to be maintained where needed (opposite column spacers) while increasing substrate distance in other areas to reduce capacitance between the thin film transistor array substrate and color filter array substrate.
2Object-generated harmful factors
If distance between substrates is increased in dummy area to reduce capacitance, then harmful factors are reduced, but cell gap uniformity deteriorates
Solution Approach 1:
The patent resolves this contradiction by implementing local quality through selective color filter pattern formation. The color filter patterns are formed only in specific regions opposite to column spacers within the dummy area, maintaining consistent cell gap in these locations while allowing increased substrate distance in other dummy area regions to reduce capacitance.
Solution Approach 2:
The patent applies segmentation by dividing the dummy area into distinct regions: areas with color filter patterns opposite column spacers (maintaining cell gap) and areas without such patterns (increased distance for capacitance reduction). This segmented approach allows simultaneous optimization of both cell gap uniformity and capacitance reduction.
Data Source
AI summary
An LCD device is disclosed. The LCD device includes: a first substrate configured to include an active area in which a plurality of thin film transistors, a plurality of pixel electrodes, a plurality of gate lines, and a plurality of data lines are formed for displaying an image, and a dummy area loaded with a driving circuit which is connected to the plurality of gate lines; a second substrate, opposite to the first substrate, configured to include a common electrode together with the plurality of pixel electrodes used for forming electric fields, and color filters and a black matrix formed opposite to the active area; column spacers secured to the first substrate within the active and dummy areas and configured to maintain a constant cell gap between the first and second substrates; and a liquid crystal layer interposed between the first and second substrates. The second substrate is configured to further include color filter patterns formed on its portions opposite to only the column spacers within the dummy area.