Mesh Lower Pattern Shielding for Stable Display Transistors
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Polarized organic materials in display devices can affect the electrical characteristics of transistors due to electric fields generated by signals and voltages, leading to deteriorated display quality.
Innovation Solution
A display device with a lower pattern layer comprising a first lower pattern with a mesh shape and a second lower pattern surrounding it, which shields the active pattern from polarization and reduces resistance deviations, preventing static electricity and electric breakdown.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If organic materials are used in the substrate, then the display device can be manufactured with current processes, but the organic materials become polarized by electric fields causing deterioration of display quality
Solution Approach 1:
A lower pattern layer is introduced as an intermediary component between the substrate and the active pattern. This lower pattern layer, positioned at a specific distance from the active pattern, acts as a mediator to reduce the harmful electrical effect of polarized organic materials on the transistor characteristics, thereby maintaining display quality while preserving the manufacturability benefits of organic substrates.
2Ease of operation
If signals and voltages are provided to the display panel, then the display device can operate and display images, but electric fields are generated that polarize organic materials and affect transistor electrical characteristics
Solution Approach 1:
The lower pattern layer serves as a protective intermediary that reduces the coupling between the electric fields generated during normal operation and the organic materials in the substrate. This allows the display device to operate normally with signals and voltages while preventing the polarization effect from degrading transistor electrical characteristics.
3Device complexity
If no lower pattern layer is used, then the device structure is simpler, but resistance deviations occur and static electricity can cause electric breakdown
Solution Approach 1:
The lower pattern layer acts as an intermediary protective structure that prevents static electricity accumulation and electric breakdown. By positioning this layer at an appropriate distance from the active pattern, it provides electrical stability and prevents harmful effects without requiring direct contact or complex integration.
Solution Approach 2:
Instead of adding more layers in the vertical stacking direction, the lower pattern layer is positioned in the horizontal plane at a specific distance from the active pattern. This dimensional approach provides protection against static electricity and resistance deviations while maintaining a relatively simple overall device structure.
4Reliability
If the lower pattern is positioned close to the active pattern, then the shielding effect is stronger, but the manufacturing precision requirements increase
Solution Approach 1:
The shielding function is achieved by positioning the lower pattern layer in the horizontal plane at a controlled distance from the active pattern, rather than placing it directly above or below. This dimensional arrangement provides effective shielding while allowing for more relaxed manufacturing precision requirements compared to vertical stacking approaches.
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 solution enhances display quality by maintaining stable electrical characteristics of transistors and preventing luminance deviations between pixels.
Implementation Method 1
Organic materials included in a substrate of the display panel may be polarized by the electric field
Implementation Method 2
An electric field may be generated inside the display panel due to signals and voltages provided to the display panel
Data Source
AI summary
A display device includes a substrate including an organic film layer, a first lower pattern which is disposed on the substrate, includes overlap patterns, first bridges, and second bridges, and has a mesh shape, a second lower pattern which is disposed in a same layer as the first lower pattern, is connected to the first lower pattern, and surrounds the first lower pattern, a first active pattern disposed on the first lower pattern, and a plurality of gate electrodes disposed on the first active pattern and overlapping the overlap patterns.