Flat Panel Display Conductive Substrate Back Bias Voltage Control
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Solution Overview
Problem
Conductive substrates in flat panel displays are prone to electrical characteristic cutoff and undesired voltage fluctuations due to static and unpredictable electric charges, affecting the threshold voltage of thin film transistors and resulting in changes in luminance, gray scale, and contrast.
Innovation Solution
A flat panel display design that includes a conductive substrate with laminated insulating layers, a substrate-exposing part, and a metal member for transferring a back bias voltage from a system control panel to the substrate, which is connected via an interface panel and controller to adjust and stabilize the threshold voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conductive substrate is used to form thin film transistors, then the display device becomes lighter and less fragile, but the threshold voltage fluctuates due to static and unpredictable electric charges
Solution Approach 1:
An insulating layer is introduced between the conductive substrate and the thin film transistor as an intermediary element. This insulating layer blocks the direct transmission of static and unpredictable electric charges from the conductive substrate to the thin film transistor, thereby preventing threshold voltage fluctuations while maintaining the lightweight and flexible properties of the conductive substrate
2Reliability
If glass substrate is used to form thin film transistor, then the threshold voltage is stable, but the display device becomes thick and heavy
Solution Approach 1:
The patent uses a composite structure combining a conductive substrate (for lightness and flexibility) with an insulating layer (for electrical isolation and threshold voltage stability). This composite material approach allows the display device to achieve both lightweight properties and stable threshold voltage characteristics, avoiding the need for heavy glass substrates
3Adaptability or versatility
If back bias voltage is applied to conductive substrate, then the threshold voltage can be tuned, but electrical characteristic cutoff occurs due to undesired voltage fluctuations
Solution Approach 1:
The insulating layer serves as a mediator that allows controlled back bias voltage to be applied to the conductive substrate for threshold voltage tuning, while simultaneously blocking undesired voltage fluctuations and static charges. This enables reliable electrical characteristic tuning without cutoff phenomena
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 electrical characteristic cutoff and undesired voltage fluctuations, enhancing the mobility, leakage current, and threshold voltage characteristics of thin film transistors, thereby maintaining consistent luminance, gray scale, and contrast in display devices.
Implementation Method 1
a metal member for transferring a back bias voltage from a system control panel to the substrate
Data Source
AI summary
A flat panel display and method for driving the same. The flat panel display includes a conductive substrate forming an image display unit having at least one thin film transistor and a pad unit including a plurality of terminals, wherein the conductive substrate is laminated with a plurality of insulating layers to form the image display unit and the pad unit; a substrate-exposing part for exposing the conductive substrate is formed by removing at least one area of the insulating layers formed on the pad unit; a system control panel for supplying a reverse bias voltage through the substrate-exposing part, wherein the system control panel is electrically connected with the pad unit; and a metal member for transferring the reverse bias voltage to the conductive substrate, wherein the metal member is formed between the substrate-exposing part and the system control panel.