LCD Counter Electrode Connection via Striding Conductive Layers
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Solution Overview
Problem
Conventional liquid crystal display devices face challenges in reducing crossing capacitance and efficiently connecting counter electrodes across pixels, limiting the arrangement of counter voltage signal lines every two or more lines in a pixel group.
Innovation Solution
The liquid crystal display device is configured with counter electrodes electrically connected using conductive layers that stride over gate signal lines, allowing for counter voltage signal lines to be arranged every one or two other lines, enabling connections between pixels in both directions and reducing intersecting capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If counter voltage signal lines are arranged every one other line with respect to pixel groups, then the number of counter voltage signal lines is reduced, but the counter electrodes cannot be electrically connected with counter electrodes of pixels arranged in both directions
Solution Approach 1:
The pixel array is segmented into odd-numbered pixel groups and even-numbered pixel groups. Counter voltage signal lines are arranged every other line for odd-numbered groups, while even-numbered groups use conductive layers for connection. This segmentation allows reduced signal line quantity while maintaining electrode connectivity through alternative means.
Solution Approach 2:
Conductive layers act as intermediary elements to connect counter electrodes in even-numbered pixel groups. These conductive layers bridge the gap where counter voltage signal lines are intentionally omitted, enabling electrical connection without requiring signal lines in every pixel group.
2Reliability
If drain signal lines are made wider to reduce resistance, then the crossing capacitance with counter voltage signal lines increases
Solution Approach 1:
The signal line arrangement exhibits asymmetry where odd-numbered pixel groups have counter voltage signal lines with narrower drain signal lines, while even-numbered groups use conductive layers allowing wider drain signal lines. This asymmetric design optimizes each region's performance characteristics.
Solution Approach 2:
The display panel is divided into regions with different signal line configurations. By segmenting the pixel groups and applying different connection methods (signal lines vs. conductive layers) to different segments, the design achieves overall optimization of both resistance and capacitance characteristics.
Data Source
AI summary
A display device with a plurality of gate signal lines extended in the first direction; a plurality of drain signal lines extended in the second direction; a plurality of pixel regions in a state that each pixel region includes a switching device, a pixel electrode which is connected with the drain signal line and a counter electrode. The counter electrode is formed with respect to the pixel electrode by way of an insulation film and is formed every pixel. The pixels include first pixels and second pixels, wherein only the first pixels have a counter voltage signal line which extends in the first direction, and the counter voltage signal line is connected with the counter electrodes in the first pixels. Further, the counter electrodes of the first pixels and the counter electrodes of the second pixels are electrically connected with each other using conductive stride over the gate signal line.