Segmented Light Shielding Film for LCD Parasitic Capacitance
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Solution Overview
Problem
In liquid crystal display panels, the conventional light shielding film covering multiple channel regions generates large parasitic capacitance between the source and drain regions, affecting the performance of thin film transistors.
Innovation Solution
The light shielding film is arranged in the form of separate elements, each covering individual channel regions, rather than a single continuous film, to minimize parasitic capacitance between the source and drain regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single continuous light shielding film covers multiple channel regions, then space is saved and manufacturing is simplified, but large parasitic capacitance is generated between source/drain regions and the light shielding film
Solution Approach 1:
The light shielding film is divided into multiple separate light shielding film elements corresponding to each gate electrode, rather than using a single continuous film. This segmentation reduces the parasitic capacitance between the source/drain regions and the light shielding film while still providing effective light shielding for each channel region.
2Object-affected harmful factors
If the light shielding film follows the semiconductor layer route, then complete coverage is achieved, but the film extends longer and increases parasitic capacitance
Solution Approach 1:
The light shielding film is segmented into discrete elements positioned under each gate electrode rather than forming a continuous path following the semiconductor layer. This provides sufficient light shielding coverage for each channel region while minimizing the total film area and associated parasitic capacitance.
Data Source
AI summary
The present invention aims to provide a liquid crystal display panel having a structure in which a plurality of gate electrodes are arranged on a continuous semiconductor layer and still capable of suppressing increase of a parasitic capacitance between a source region and a drain region. The liquid crystal display panel of the invention includes a thin film transistor. The thin film transistor includes: a base insulating film; a semiconductor layer extending linearly at least from a first portion to a second portion; a source electrode; a drain electrode; and gate electrodes, respectively, to cover the semiconductor layer with a gate insulating film therebetween. A light shielding film is arranged to cover each projection region corresponding to projection of the gate electrode. The light shielding film is arranged in the form of a plurality of light shielding film elements. The light shielding film elements each cover one or more projection regions.