Transparent Electrode Stack With Metal Grid for Oxide Display Stability
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Solution Overview
Problem
In display devices using oxide semiconductors, increasing the number of pixels for higher definition leads to higher resistance in transparent electrodes, causing voltage drops and sensitivity to light irradiation, which affects the characteristics of the oxide semiconductor transistors.
Innovation Solution
A display device configuration that includes a metal layer acting as a common auxiliary electrode, which reduces the time constant of the common electrode and shields light from adjacent pixels, thereby stabilizing the transistor characteristics and improving reliability by sandwiching the oxide semiconductor layer between the light-shielding layer and the metal layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of pixels is increased for higher definition, then the display resolution is improved, but the resistance of transparent electrodes increases causing voltage drops
Solution Approach 1:
The common electrode is divided into multiple segments (first common electrode and second common electrode) that are arranged in a grid pattern. This segmentation reduces the resistance of the common electrode by creating multiple parallel conduction paths, thereby preventing voltage drops while maintaining high display resolution.
Solution Approach 2:
The patent introduces a grid-like arrangement of common electrodes extending in both first and second directions, transforming the traditional single-layer common electrode into a two-dimensional network. This dimensional change reduces the effective resistance by providing multiple conduction pathways across the pixel array.
2Measurement precision
If the number of pixels is increased for higher definition, then the display resolution is improved, but the transparent electrodes become more sensitive to light irradiation affecting transistor characteristics
Solution Approach 1:
A light-shielding layer is introduced as an intermediary between the transparent electrodes and incident light. This layer selectively blocks harmful light irradiation from reaching the oxide semiconductor transistors while allowing the display structure to maintain its high-resolution capability.
Solution Approach 2:
The patent converts the harmful effect of light irradiation into a beneficial shielding function by positioning the light-shielding layer to protect the oxide semiconductor transistors. The same structural elements that enable high resolution also provide the framework for effective light shielding.
3Object-affected harmful factors
If a light-shielding layer is added to protect oxide semiconductor, then light sensitivity is reduced, but the device structure becomes more complex
Solution Approach 1:
The common electrode structure serves multiple functions: it provides electrical conduction, reduces resistance through grid arrangement, and works in conjunction with the light-shielding layer to protect against light sensitivity. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity.
Solution Approach 2:
The light-shielding function is merged with the existing common electrode structure rather than being implemented as a completely separate layer. The grid-like arrangement of common electrodes is positioned to simultaneously provide electrical function and light shielding, combining multiple functions into a unified structure.
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
The configuration reduces the time constant of the common electrode and suppresses light irradiation to the oxide semiconductor, maintaining stable transistor characteristics and improving the reliability and aperture ratio of the display device.
Implementation Method 1
a light-shielding layer and the metal layer. The configuration reduces the time constant of the common electrode and suppresses light irradiation to the oxide semiconductor
Data Source
AI summary
A display device includes a plurality of pixels arranged in a matrix on a substrate along a first direction and a second direction intersecting the first direction. Each of the plurality of pixels includes a transistor, a first transparent electrode located over the transistor and electrically connected to the transistor, a second transparent electrode located over the first transparent electrode and electrically connected to the first transparent electrode via an opening, an insulating layer located over the second transparent electrode, a third transparent electrode located over the insulating layer; and a metal layer in contact with the third transparent electrode. The opening overlaps a gate electrode of the transistor. At least a part of the metal layer is provided in the opening and overlaps the gate electrode. The metal layer extends along the first direction and is commonly provided in the pixels arranged in the first direction.