Array Substrate Charge Release Circuit for Display Panel Stability
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Solution Overview
Problem
In large-size display panels, the abrasion between spacers and the array substrate generates electrostatic charges, leading to conduction between the source and drain electrodes, causing unstable press spots during black picture display due to accumulated charges.
Innovation Solution
The array substrate incorporates a first and second conductive structure made of the same material as the pixel electrode, disposed on the passivation layer above the TFT and data/gate lines, respectively, to form a charge release circuit that discharges charges generated from spacer abrasion, preventing electrostatic fields in the TFT channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a spacer is provided between the two substrates to reduce panel deformation, then the panel stability is improved, but the spacer abrasion with the passivation layer generates electrostatic charges that cause press spot defects
Solution Approach 1:
A conductive layer is introduced as an intermediary between the spacer and the passivation layer. This conductive layer serves as a mediator that provides a controlled path for electrostatic charges generated by spacer abrasion, preventing charge accumulation in the TFT channel while maintaining panel stability
Solution Approach 2:
The harmful electrostatic charges generated by spacer abrasion are converted into a beneficial effect by providing a conductive path that directs these charges away from the TFT channel. The same abrasion that previously caused harmful charge accumulation now generates charges that are harmlessly discharged through the conductive layer
2Reliability
If the spacer presses against the TFT to avoid spacer displacement, then the spacer positioning is improved, but the abrasion between spacer and TFT generates charges that cause conduction between source and drain electrodes
Solution Approach 1:
The conductive layer acts as an intermediary that intercepts electrostatic charges generated by spacer-TFT abrasion before these charges can enter the TFT channel. This maintains reliable spacer positioning while preventing harmful electrode conduction
Solution Approach 2:
The harmful electrostatic charges are extracted from the system by providing a dedicated conductive path that removes charges at their generation point, preventing them from affecting the source-drain electrode conduction control
3Power
If charges accumulate in the TFT channel due to spacer abrasion, then an electric field is formed that causes conduction, but this results in unstable press spots during black picture display
Solution Approach 1:
The conductive layer serves as a mediator that provides a controlled discharge path for electrostatic charges, preventing uncontrolled charge accumulation in the TFT channel that would cause unstable press spots during display operation
Solution Approach 2:
The conductive layer provides a feedback mechanism by continuously dissipating electrostatic charges as they are generated, preventing the buildup of charges that would otherwise create unstable electric fields and press spot defects during display operation
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 solution effectively prevents the formation of press spots by ensuring no charge accumulation in the TFT channel, maintaining proper electrode disconnection and enhancing display stability and quality.
Implementation Method 1
the first conductive structure and the second conductive structure form a charge release circuit to release charges generated by the abrasion between the spacer and the array substrate
Implementation Method 2
electrostatic charges (often being positive charges) are generated, thus forming an electric field which causes charges (often being electrons) to accumulate in the channel of the TFT
Implementation Method 3
the spacer 4 and a passivation layer 3 in the array substrate will abrade with each other and electrostatic charges (often being positive charges) are generated
Data Source
AI summary
An array substrate comprises a TFT, a data line, a gate line and a passivation layer covering the TFT, the data line and the gate line. The array substrate further includes a first conductive structure and a second conductive structure connected with the first conductive structure, the first conductive structure is disposed on the passivation layer and above the TFT, and the second conductive structure is disposed on the passivation layer and above the data line and/or gate line. A method for manufacturing the array substrate and a display device having such an array substrate are also provided.