Electrode Power Supply Line Peripheral Layout for Display Area Ratio
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Solution Overview
Problem
Active matrix type electroluminescent display devices face a reduction in the proportion of display area relative to the substrate due to the layout of driving circuits and wirings, leading to increased dead space and luminance deterioration caused by voltage drops.
Innovation Solution
The electroluminescent display device features an electrode power supply line arranged along the outer periphery of the display area, directly contacting the second electrode layer, with a pixel definition layer interposed between them, and includes conductive layers to reduce voltage drop and improve contact, thereby increasing the display area to substrate ratio and ensuring uniform luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If driving circuits and wirings are laid out on the substrate, then the device can function properly, but the proportion of display area relative to substrate area is reduced
Solution Approach 1:
The patent moves the electrode power supply line from the substrate plane to the edge of the substrate, utilizing the peripheral dimension. This dimensional relocation allows the power supply line to be positioned outside the active display area, thereby increasing the display area proportion while maintaining proper device functionality through edge-contact configuration.
2Reliability
If electrode wiring is arranged on the substrate, then power can be supplied to electrodes, but voltage drop occurs causing luminance deterioration
Solution Approach 1:
The patent extracts the electrode power supply line from the internal substrate wiring and relocates it to the substrate edge. This extraction eliminates the long internal wiring paths that cause voltage drops, thereby improving luminance uniformity across the display area while maintaining effective power supply to the electrodes through direct edge contact.
3Area of stationary object
If the substrate size is increased to accommodate wiring and circuits, then proper layout is achieved, but the display area to substrate area ratio decreases
Solution Approach 1:
The patent utilizes the peripheral dimension of the substrate by positioning the power supply line at the edge, rather than requiring additional substrate area for internal wiring. This approach maintains a compact substrate size while maximizing the display area to substrate area ratio.
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 configuration enhances the ratio of display area to substrate area, reduces nonuniformity and luminance deterioration, and allows for a smaller substrate for the same display size or a larger display on the same substrate, while preventing voltage drops and improving contact resistance.
Implementation Method 1
The electroluminescence display device utilizes the light emission principle in which, when an electric field is applied between the two electrodes, electrons are injected from the cathode side and holes are injected from the anode side. The electrons are recombined with the holes in the light emitting layer to form an excited state and energy generated when the excited state returns to the ground state is emitted as light.
Data Source
AI summary
An electroluminescent display device may include a display area formed on one surface of a substrate. It may further include a first electrode layer, a second electrode layer, and an electroluminescent emission layer between the first and second electrode layers. It may also include an electrode power supply line that supplies electrode power to the display area. The electrode power supply line can be located at least partially on an outer periphery of the display area, and may directly contact the second electrode layer. An electrical component may be arranged under the electrode power supply line, and may have one or more conductive layers.