Display Device Insulating Filler Prevents Electrode Short Circuits
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Solution Overview
Problem
As display device definitions increase, there is a demand to reduce the size of pixel electrodes while maintaining storage capacitance, which poses challenges in preventing short circuits between the pixel electrode and the common electrode.
Innovation Solution
The display device incorporates a filling material with insulation properties between the pixel electrode and the common electrode, ensuring they remain insulated even if the pixel electrode is exposed, thus preventing short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the pixel electrode size is reduced to increase display definition, then the display definition is improved, but the risk of short circuit between pixel electrode and common electrode increases
Solution Approach 1:
A filler material is introduced as an intermediary substance between the pixel electrode and common electrode. This filler occupies the through-hole space and provides insulation, preventing direct contact between the electrodes while allowing the pixel electrode to maintain its reduced size for high definition display.
Solution Approach 2:
The solution moves from a two-dimensional planar insulation approach to a three-dimensional approach by filling the vertical through-hole space with insulating material. This adds a depth dimension to the insulation strategy, ensuring electrical isolation even when electrodes are closely spaced horizontally.
2Quantity of substance
If three layers of transparent electrodes are stacked to increase storage capacitance, then the storage capacitance is improved, but the device complexity increases
Solution Approach 1:
The filler material serves multiple functions simultaneously: it provides electrical insulation between electrodes, maintains the structural integrity of the through-hole, and supports the pixel electrode. This multi-functionality reduces the need for additional separate components, thereby managing complexity while achieving the capacitance increase goal.
3Measurement precision
If the pixel electrode size is reduced, then the display definition is improved, but the storage capacitance decreases
Solution Approach 1:
The invention changes the parameter of electrode configuration from single-layer to three-layer stacked transparent electrodes. This parameter change increases the effective capacitance storage volume within the reduced pixel area, allowing high definition display to be achieved while maintaining adequate storage capacitance.
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 effectively maintains the display quality by preventing short circuits and ensuring the pixel electrode and common electrode remain insulated, even with increased definition.
Implementation Method 1
a filler having an insulation property filled in at least the first through-hole and located on the pixel electrode and the first capacitance insulating film
Data Source
AI summary
According to one embodiment, a display device includes a first substrate and a second substrate opposed to the first substrate. The first substrate includes an insulating substrate, a switching element located on the insulating substrate and having a relay electrode, an organic insulating film covering the switching element and having a first through-hole penetrating to the relay electrode, a pixel electrode being in contact with the relay electrode via the first through-hole, a first capacitance insulating film covering the pixel electrode, a filler having an insulation property filled in at least the first through-hole and located on the pixel electrode and the first capacitance insulating film, and a common electrode covering the filler.