Flat Panel Display Conductive Film Voltage Drop Prevention
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Solution Overview
Problem
In Active Matrix flat panel displays, voltage drops in the driving power supply lead to non-uniform brightness and image degradation, particularly exacerbated by the presence of multiple capacitors in larger screens, affecting the operation of electronic devices like CMOS Thin Film Transistors and interrupting the functioning of scan and data drivers.
Innovation Solution
A flat panel display design that includes a conductive film interposed between the substrate and insulating film, electrically connected to the pixel circuit and capacitor units, with parallel capacitors and conductive patterns acting as electrodes to prevent voltage drops and supply driving power, ensuring uniform voltage distribution across the pixel and circuit regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an additional power supply layer is formed to prevent voltage drop, then voltage distribution uniformity is improved, but the operation of electronic devices in the circuit region may be interrupted
Solution Approach 1:
The power supply structure is segmented into two distinct parts: a conventional power supply layer in the circuit region and a novel conductive film power supply layer in the pixel region. This segmentation allows each layer to serve its specific function without interfering with electronic devices in the circuit region, resolving the contradiction between improving voltage uniformity and preventing device interruption.
Solution Approach 2:
The conductive film is selectively applied only in the pixel region rather than uniformly across the entire substrate. This local application ensures that the power supply improvement is targeted where needed (pixel region) while leaving the circuit region unaffected, thus maintaining electronic device operation integrity while achieving voltage uniformity in the pixel area.
2Area of stationary object
If the screen size is increased and more capacitors are added, then display area is improved, but voltage drop in capacitors increases
Solution Approach 1:
The power supply approach transitions from two-dimensional planar power lines to a three-dimensional structure by inserting a conductive film between the substrate and insulating film. This dimensional change creates a new power supply pathway that is electrically closer to the pixel circuits, reducing voltage drop even as screen size and capacitor count increase.
3Device complexity
If conventional power supply lines are used, then device complexity is minimized, but voltage drop causes non-uniform brightness
Solution Approach 1:
The conductive film acts as an intermediary power supply element between the substrate and the pixel circuits. It mediates the power delivery by providing a low-resistance path that compensates for the limitations of conventional power lines, achieving brightness uniformity without significantly increasing device complexity.
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 effectively prevents voltage drops in the driving power and capacitor units, maintaining image quality and operational integrity of electronic devices by ensuring consistent power supply and reducing the risk of electrical disconnection and device interruption.
Implementation Method 1
a conductive film interposed between the substrate and the insulating film in a region corresponding to the pixel region and electrically connected to one electrode of the at least one light emitting diode
Data Source
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AI summary
A flat panel display that can prevent a voltage drop of a driving power and, at the same time, minimizes the characteristic reduction of electronic devices located in a circuit region where various circuit devices are located includes: a substrate; an insulating film arranged on the substrate; a pixel region including at least one light emitting diode, the pixel region arranged on the insulating film and adapted to display an image; a circuit region arranged on the insulating film and including electronic devices adapted to control signals supplied to the pixel region; and a conductive film interposed between the substrate and the insulating film in a region corresponding to the pixel region and electrically connected to one electrode of the light emitting diode.