Transparent Capacitor Driving Circuit for SOG Moisture Prevention
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Solution Overview
Problem
The integration of a gate driving circuit on a display panel using system on glass (SOG) technology faces issues with parasitic capacitance, leading to abnormal operations and reduced reliability due to incomplete curing of sealants caused by insufficient light penetration, which allows external moisture to erode electrical components.
Innovation Solution
A driving circuit design featuring a capacitor made of transparent conductive material is placed between thin-film transistors (TFTs) to enhance light transmittance, ensuring complete curing of sealants and preventing moisture ingress by positioning the capacitor in gaps between TFTs and using transparent conductive materials for electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sealant is disposed directly on the gate driving circuit to reduce parasitic capacitance, then the parasitic capacitance is effectively reduced, but the sealant cannot be completely cured due to insufficient light penetration
Solution Approach 1:
The gate driving circuit is segmented into multiple layers, with the sealant disposed between the gate driving circuit and the common electrode rather than directly on the gate driving circuit. This layering allows light to penetrate through the gate driving circuit to the sealant for complete curing while maintaining the parasitic capacitance reduction effect.
Solution Approach 2:
The gate driving circuit itself acts as an intermediary layer between the sealant and the common electrode. By positioning the sealant between the gate driving circuit and the common electrode, the gate driving circuit mediates the light transmission path, enabling sufficient light to reach the sealant for complete curing while maintaining electrical isolation to reduce parasitic capacitance.
2Illumination intensity
If the sealant is incompletely cured due to blocked light, then light transmittance is insufficient, but external moisture can permeate through the sealant to erode electrical components
Solution Approach 1:
The structure is segmented into multiple functional layers with the sealant positioned between the gate driving circuit and the common electrode. This segmentation ensures that light can penetrate through the gate driving circuit to completely cure the sealant, creating an effective moisture barrier that prevents external moisture from reaching and eroding the electrical components of the gate driving circuit.
Solution Approach 2:
The sealant is positioned and cured in advance to form a protective barrier layer before the display device is assembled and exposed to environmental conditions. This prior cushioning ensures that the sealant is fully cured and provides effective protection against moisture permeation from the beginning of the device operation.
3Illumination intensity
If the capacitor uses transparent conductive material to improve light transmittance, then light can penetrate through the capacitor, but the capacitor must be positioned in gaps between TFTs to avoid blocking light
Solution Approach 1:
The capacitor is positioned in the gap between adjacent TFTs rather than overlapping with the TFT active areas. This local positioning strategy allows the capacitor to be made of transparent conductive material that permits light transmission, while the gap positioning ensures that the capacitor does not block light paths and maintains the overall light transmittance of the display device.
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
This design improves the bonding effect and reliability of the display device by ensuring complete sealant curing and blocking external moisture, thereby preventing electrical component erosion and enhancing the operational stability of the driving circuit.
Implementation Method 1
the capacitor has a first and a second electrode each including a transparent conductive material
Implementation Method 2
A display device with a system on glass (SOG) applying such driving circuit can improve its bonding effect and effectively block external moisture from permeating into the internal of the display device
Data Source
AI summary
The present invention provides a driving circuit and a display device. The driving circuit is disposed on a substrate of the display device. The driving circuit includes thin film transistors (TFTs), a capacitor and clock signal lines. Each of the TFTs includes a gate, a source and a drain. The capacitor is coupled to at least one of the TFTs, and includes a first and a second electrode. The material of the first and the second electrode includes a transparent conductive material. The clock signal lines extend along a first direction. The source and the drain of at least two of the TFTs respectively extend along a second direction. The angle between the first direction and the second direction is between 80 degrees and 100 degrees. At least a partial structure of the capacitor is located in a gap between adjacent ones of the TFTs.