Oxide Semiconductor Insulator for Display Pixel Repair
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Solution Overview
Problem
Existing methods for repairing bright pixel defects in display apparatuses, such as those with twisted nematic or fringe field switching structures, face issues with unreliable connections due to variations in laser power, leading to power shortages or excesses, which can damage surrounding areas and result in incomplete or temporary repairs.
Innovation Solution
An array substrate with a transparent insulating substrate, insulating film containing silicon oxide or metal oxide, and an insulator portion formed by converting an oxide semiconductor film into an insulator, where ultraviolet irradiation is used to excite electron carriers and establish reliable conduction between conductive films, thereby enabling effective repair of bright pixel defects to dark pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If laser beam irradiation is used to short-circuit conductive films for repairing bright pixel defects, then repair can be achieved, but variations in laser power cause unreliable connections leading to power shortages or excesses that can damage surrounding areas and result in incomplete or temporary repairs
Solution Approach 1:
The patent introduces an oxide semiconductor film as an intermediary material between the first and second conductive films. This intermediary layer can be selectively converted into a conductive state through ultraviolet irradiation, providing a controlled and reliable conduction path without the risks associated with laser power variations. The oxide semiconductor film acts as a mediator that enables safe and effective electrical connection between conductive films for defect repair.
Solution Approach 2:
The patent utilizes parameter changes by converting the oxide semiconductor film from an insulating state to a conductive state through ultraviolet irradiation. This parameter change (electrical conductivity) is controlled by light exposure rather than thermal energy, eliminating the problems of power shortage or excess associated with laser methods. The conductivity parameter can be precisely adjusted by controlling the ultraviolet irradiation conditions.
2Reliability
If laser power is increased to ensure sufficient short-circuit conduction, then electrical conduction is achieved, but the periphery of the location to be repaired and sublayer patterns are damaged
Solution Approach 1:
The oxide semiconductor film serves as a protective intermediary that confines the electrical conduction path between the first and second conductive films. By using this intermediary approach with ultraviolet irradiation instead of high-power laser, the harmful thermal effects on peripheral areas and sublayer patterns are eliminated while still achieving the necessary electrical conduction for defect repair.
Solution Approach 2:
The patent replaces the thermal-mechanical laser irradiation system with an optical-ultraviolet irradiation system. This substitution changes the mechanism from thermal heating (which causes peripheral damage) to photo-induced conductivity change (which is localized and non-thermal), thereby achieving reliable electrical conduction without damaging the surrounding structures.
3Object-affected harmful factors
If laser power is decreased to avoid damage, then peripheral areas are protected, but insufficient short-circuit conduction occurs
Solution Approach 1:
The patent changes the parameter control mechanism from thermal power (laser intensity) to optical exposure (ultraviolet irradiation dose). This parameter change allows for achieving sufficient electrical conduction in the oxide semiconductor film without the risk of power excess causing peripheral damage. The ultraviolet irradiation can be precisely controlled to achieve the desired conductivity level without thermal effects.
4Ease of repair
If conventional repair methods are used, then bright pixel defects can be repaired, but the connection is not reliable enough and wires may break again due to deterioration over time
Solution Approach 1:
The oxide semiconductor film acts as a dedicated, replaceable intermediary component designed specifically for the repair function. This material can be easily converted between insulating and conductive states, providing a stable and durable connection that resists deterioration over time. The use of this specialized material ensures long-term reliability of the repair connection.
Solution Approach 2:
The patent employs a composite structure consisting of the oxide semiconductor film combined with the existing conductive films. This composite approach creates a multi-layered connection system that leverages the advantages of each material: the oxide semiconductor provides controlled conductivity and stability, while the conductive films provide low-resistance electrical paths. This composite structure enhances the overall durability and reliability of the repair connection.
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 reduces faulty repairs by ensuring reliable electrical conduction and maintaining the integrity of the substrate, improving the quality and yield of display apparatuses by minimizing damage and maintaining connection stability over time.
Implementation Method 1
Irradiating the oxide semiconductor film converted into the insulator with ultraviolet rays enables a conduction between one conductive film and the other conductive film each in direct contact with the oxide semiconductor film
Data Source
AI summary
A technique disclosed in the present specification relates to reducing failures at repairing a bright pixel defect to be a dark pixel. An array substrate for a display apparatus, in this technique includes an insulating substrate that is transparent, an insulating film at least partly disposed on an upper surface of the insulating substrate and containing silicon oxide or metal oxide as a main component, a first conductive film, a second conductive film spaced apart from the first conductive film, and an insulator portion that is in direct contact with and extends between the first conductive film and the second conductive film. The insulator portion is formed by converting an oxide semiconductor film into an insulator. The insulator portion includes an upper surface or lower surface in direct contact with the insulating film.