Active Matrix Substrate Auxiliary Capacitance Electrode Segmentation
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Solution Overview
Problem
The existing liquid crystal display device configurations with increased pixel capacitance require larger TFTs, leading to increased parasitic capacitance, which affects display quality and touch-panel-equipped display devices.
Innovation Solution
An active matrix substrate with auxiliary capacitance electrode portions that overlap with pixel electrodes, separated from other conductive layer portions, reduces parasitic capacitance and improves display quality by maintaining appropriate pixel capacitance in line with the driving capability of the TFT.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the pixel capacitance is increased by providing common electrodes above and below the pixel electrode with insulating films, then the pixel capacitance is improved, but the TFT size must be increased leading to increased parasitic capacitance
Solution Approach 1:
The conductive layer is segmented into auxiliary capacitance electrode portions that are spatially separated from other portions of the conductive layer. This segmentation allows the auxiliary capacitance electrodes to provide additional capacitance without creating excessive parasitic capacitance between adjacent conductive regions, thereby resolving the contradiction between increasing pixel capacitance and reducing parasitic capacitance
Solution Approach 2:
The auxiliary capacitance electrode portions act as intermediary elements that provide additional capacitance to the pixel through the insulating layer, without directly connecting to other conductive elements. This intermediary structure enables capacitance enhancement while maintaining electrical isolation that prevents parasitic capacitance formation
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces parasitic capacitance, enhancing display quality and touch position detection accuracy while preventing unnecessary capacitance increases, thus improving the overall performance of the display device.
Implementation Method 1
the conductive layer includes auxiliary capacitance electrode portions that are provided so as to be opposed to the pixel electrodes, respectively, and overlap with the pixel electrodes, thereby forming capacitors
Data Source
AI summary
Provided is an active matrix substrate in which parasitic capacitance can be reduced and the display quality can be improved is provided, a touch-panel-equipped display device including the same, and a liquid crystal display device including the same. An active matrix substrate 1 includes a plurality of pixel electrodes 31; a plurality of counter electrodes provided so as to be opposed to the pixel electrodes 31, respectively, capacitors being formed between the counter electrodes 21 and the pixel electrodes 31; a conductive layer provided on a side opposite to the counter electrodes 21 with respect to the pixel electrodes 31; a first insulating layer 461; and a second insulating layer 462. The first insulating layer 461 is arranged between the pixel electrodes 31 and the conductive layer, and the second insulating layer 462 is arranged between the pixel electrodes 31 and the counter electrodes 21. The conductive layer includes auxiliary capacitance electrode portions 48 that are provided so as to be opposed to the pixel electrodes, respectively, and form capacitors between the same and the pixel electrodes 31, and the auxiliary capacitance electrode portions 48 and the other portions of the conductive layer than the auxiliary capacitance electrode portions 48 are positioned apart from each other.