Shared Bias Transistor Pixel Layout for Higher-Resolution Displays
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Solution Overview
Problem
Existing display devices face challenges in reducing the arrangement area for pixels to increase resolution, as the inclusion of multiple elements increases the surface area, thereby decreasing resolution.
Innovation Solution
The display device incorporates a design where first and second pixels share a bias transistor, with each pixel including a light emitting element, a driving transistor, a switching transistor, and a capacitor, and utilizes dummy electrodes to create parasitic capacitances that reduce the overall space required.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple elements (transistors, capacitors, etc.) are included in each pixel to ensure proper driving functionality, then the reliability of pixel operation is improved, but the arrangement area increases and resolution decreases
Solution Approach 1:
Adjacent pixels share common bias transistors and capacitors. Specifically, a first pixel and a second pixel share a first bias transistor and a first capacitor, while a third pixel and a fourth pixel share a second bias transistor and a second capacitor. This merging of components reduces the total number of elements needed per pixel area, thereby decreasing the arrangement area while maintaining proper driving functionality and reliability.
2Device complexity
If the surface area for arranging pixel elements is increased to accommodate all necessary components, then the completeness of pixel functionality is improved, but the resolution of the display device decreases
Solution Approach 1:
The patent implements sharing of bias transistors and capacitors between adjacent pixels. The first pixel and second pixel share the first bias transistor and first capacitor, while the third pixel and fourth pixel share the second bias transistor and second capacitor. This consolidation reduces the number of components that need to be manufactured and arranged in each pixel region, thereby improving resolution without compromising the completeness of pixel driving functionality.
Solution Approach 2:
The shared bias transistors and capacitors serve multiple pixels simultaneously, making these components universal resources for the display device. The first bias transistor and first capacitor serve both the first and second pixels, while the second bias transistor and second capacitor serve both the third and fourth pixels. This multi-functionality approach reduces overall component count and improves resolution while maintaining complete pixel functionality.
3Measurement precision
If each pixel has dedicated bias transistors and capacitors to ensure proper voltage control, then the luminance control precision is improved, but the difference in luminance between adjacent pixels increases
Solution Approach 1:
Adjacent pixels share common bias transistors and capacitors, which ensures that the bias voltage and holding capacitance are uniform across adjacent pixel regions. The first pixel and second pixel share the first bias transistor and first capacitor, while the third pixel and fourth pixel share the second bias transistor and second capacitor. This sharing mechanism promotes luminance uniformity by eliminating variations that would arise from manufacturing differences in dedicated components, while the precise voltage control is maintained through the proper design of the shared components.
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
This design enhances resolution by optimizing the arrangement of elements while maintaining luminance uniformity between pixels.
Implementation Method 1
The dummy electrode may include a first portion, which extends outward from the gate electrode to overlap the source region when viewed on a plane, and provides the source region and a first parasitic capacitance, and a second portion which extends outward from the gate electrode to overlap the drain region when viewed on the plane, and provides the drain region and a second parasitic capacitance.
Data Source
AI summary
Provided is an electronic device that includes a display device. The display device has a first pixel and a second pixel. Each of the first pixel and the second pixel may include a light emitting element, a driving transistor connected to the light emitting element and a power line and controlled by a voltage of a first node, a switching transistor connected to a data line and a second node and controlled by a write scan signal, a capacitor connected to the first node and the second node, and a bias transistor connected to the driving transistor and a bias line, and controlled by a bias scan signal. The first and second pixels may share the bias transistor.