Stacked Display Electrode Layout for Bright High-Resolution Pixels
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Solution Overview
Problem
Display devices, such as liquid crystal displays, face a challenge in maintaining brightness while reducing pixel size, leading to increased energy consumption due to the need for more wiring lines, which can result in lowered brightness and alignment issues.
Innovation Solution
The implementation of a display device structure that includes an oxide semiconductor layer with a protective metal layer, inorganic and organic insulating films, and a specific layout of opening portions to optimize the connection electrodes and pixel electrode, reducing light leakage and energy consumption by using a light-shielding layer to block light from the illumination device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of wiring lines is increased to achieve higher definition, then the display resolution is improved, but the opening portion area is reduced leading to lowered brightness
Solution Approach 1:
The patent transitions from planar wiring layout to three-dimensional stacked wiring structure. Connection electrodes are arranged in multiple layers (first, second, third connection electrodes) at different heights, allowing wiring lines to be routed vertically through insulating films. This vertical dimension provides additional routing paths without occupying more horizontal pixel area, thereby maintaining the opening portion area while achieving higher definition through increased wiring capacity.
2Illumination intensity
If the brightness of illumination device is increased to compensate for lowered brightness, then the brightness is improved, but the energy consumption is increased
Solution Approach 1:
The patent extracts and eliminates the root cause of brightness loss by optimizing the wiring structure. By reconfiguring the wiring layout to maintain adequate opening portion area, the need for increased illumination device brightness is removed. The stacked connection electrode structure reduces wiring interference and improves light transmission, thereby maintaining brightness without increasing energy consumption.
3Measurement precision
If the wiring lines are increased for higher definition, then the display resolution is improved, but alignment failure and light leakage occur
Solution Approach 1:
The patent segments the wiring structure into distinct stacked layers with dedicated functions. Each connection electrode layer is separated by insulating films, creating clearly defined routing zones. This segmentation provides natural alignment references and reduces wiring interference, thereby improving alignment accuracy and preventing light leakage while supporting increased wiring density for higher definition.
Data Source
AI summary
According to one embodiment, a display device includes a first inorganic insulating film covering an oxide semiconductor layer and a protective metal layer, a second inorganic insulating film covering a gate electrode, a first connection electrode in contact with the protective metal layer at a first opening portion which penetrates through the first inorganic insulating film and the second inorganic insulating film, a first organic insulating film covering the first connection electrode, and a second connection electrode in contact with the first connection electrode at a second opening portion which penetrates through the first organic insulating film, wherein the second opening portion is located above the first opening portion.