Curved Thin-Film Transistor Layout for High-Current Small Pixels
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Solution Overview
Problem
Existing display devices using LED elements require high driving currents, which increase the pixel area, limiting the integration and resolution of high-resolution displays.
Innovation Solution
A thin film transistor with a curved active electrode design, where the active upper and lower electrodes overlap, and a longer channel width is implemented to generate high driving currents, reducing the pixel area and improving integration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the width of the active electrode is increased to generate high driving currents, then the driving current increases, but the pixel area increases
Solution Approach 1:
The patent transitions from a conventional planar active electrode to a three-dimensional structure by forming the active electrode on a convex substrate surface. This vertical dimensionality change allows the active electrode to occupy additional space in the vertical direction, effectively increasing the available area for current generation without expanding the horizontal pixel footprint.
Solution Approach 2:
The patent utilizes the curved surface of the convex substrate to form the active electrode. The curvature of the substrate surface allows the active electrode to wrap around or conform to the convex shape, increasing its effective surface area and volume within the constrained horizontal pixel area, thereby enabling higher driving currents without increasing the planar pixel dimensions.
2Productivity
If the pixel area is reduced to improve integration and resolution, then the degree of integration improves, but the driving current generation capability decreases
Solution Approach 1:
By forming the active electrode on a convex substrate, the patent creates a vertical dimension that compensates for the reduced horizontal pixel area. The three-dimensional structure provides additional volume and surface area for the active electrode, maintaining its current generation capability even when the planar pixel dimensions are reduced for higher integration.
Solution Approach 2:
The patent changes the geometric parameters of the active electrode by forming it on a convex substrate with specific curvature radius and height. This parameter change transforms the active electrode from a two-dimensional planar structure to a three-dimensional convex structure, increasing its effective area and volume, thereby maintaining driving current generation capability in smaller pixels.
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 design allows for high driving currents while minimizing the pixel area, enabling high-resolution displays with reduced bezel widths and improved luminance.
Implementation Method 1
The LED element includes an n-type electrode, a p-type electrode, and an active layer therebetween. When a current flows through the n-type electrode and the p-type electrode, electrons from the n-type electrode and holes from the p-type electrode are combined in the active layer to emit light.
Data Source
AI summary
A display panel according to one embodiment of the present disclosure includes a substrate, an active electrode over the substrate and including a source region, a drain region, and a channel region, and an active upper electrode of a curved shape over the active electrode. The channel region of the active electrode and the active upper electrode may overlap each other and the channel region may have a same shape as the active upper electrode. Accordingly, a driving element included in the display panel may generate a high driving current and the degree of integration in a pixel may be improved.