Display Pixel Electrode Layout to Reduce Light Leakage
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Solution Overview
Problem
The increase in the number of wiring lines in display devices with reduced pixel size leads to lower brightness and increased energy consumption due to the need for higher illumination, which existing technologies struggle to address effectively.
Innovation Solution
A display device design incorporating a first switching element with an oxide semiconductor layer and a second switching element with a polycrystalline silicon semiconductor layer, featuring a specific layout of connection electrodes and insulating films to optimize light shielding and reduce energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the size of one pixel is reduced to increase definition, then the number of wiring lines is increased, but the opening portion is reduced and brightness is lowered
Solution Approach 1:
The patent divides the switching element into two distinct components: a first switching element made of oxide semiconductor located in the pixel region, and a second switching element made of polycrystalline silicon located in the peripheral circuit region. This segmentation allows each type of semiconductor to be optimally positioned where its properties are most beneficial, enabling higher definition with reduced pixel size while maintaining adequate opening portions for brightness.
2Illumination intensity
If the brightness of illumination device is increased to compensate for lowering of brightness, then energy consumption is increased
Solution Approach 1:
The patent applies different semiconductor materials with different properties to different regions: oxide semiconductor in the pixel region where low leakage current is critical for maintaining brightness without excessive illumination, and polycrystalline silicon in the peripheral circuit region where high breakdown voltage is more important. This local differentiation of material properties allows the display to maintain brightness efficiency while reducing overall energy consumption.
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.