Mixed-Transistor Pixel Circuit Layout for Low-Coupling Displays
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
As display devices with higher resolutions require more complex pixel circuitry, issues such as capacitive coupling between data lines and gate electrodes lead to potential display quality problems.
Innovation Solution
The display device incorporates a pixel structure with multiple transistors, including oxide and poly-silicon transistors, along with a specific arrangement of scan lines, data lines, and reference voltage lines to minimize capacitive coupling and enhance display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If higher resolution display devices are used, then display quality is improved, but capacitive coupling between data lines and gate electrodes increases causing display quality problems
Solution Approach 1:
The patent introduces a shield line as an intermediary element positioned between the data line and the gate electrode. This shield line acts as a mediator to block or reduce the capacitive coupling effect between the data line and gate electrode, thereby resolving the harmful interaction while maintaining the high-resolution display structure
Solution Approach 2:
The patent extracts or removes the harmful capacitive coupling effect by introducing the shield line that isolates the data line from the gate electrode. The shield line effectively takes out the problematic electromagnetic interaction from the system, allowing high-resolution display without the harmful coupling effect
2Measurement precision
If multiple transistors are used in pixel circuitry, then display quality is improved, but leakage currents and flicker increase
Solution Approach 1:
The patent changes the material parameter of the transistor from conventional silicon-based semiconductor to oxide semiconductor. This parameter change fundamentally alters the electrical characteristics, achieving ultra-low leakage current (on the order of 10^-21 to 10^-24 A) while maintaining the multiple-transistor pixel circuit structure needed for high display quality
Solution Approach 2:
The patent employs oxide semiconductor materials as a composite solution that combines the benefits of low leakage current with the functionality of multiple transistors in the pixel circuit. The oxide semiconductor layer is integrated with other materials to form a composite transistor structure that achieves both high display quality and low leakage current
3Measurement precision
If multiple transistors are used in pixel circuitry, then display quality is improved, but power consumption increases
Solution Approach 1:
The patent changes the transistor material parameter to oxide semiconductor, which has extremely low leakage current characteristics. This parameter change reduces the standby power consumption of the pixel circuit while maintaining the multiple-transistor structure necessary for high display quality, as the leakage current is reduced to 10^-21 to 10^-24 A range
Data Source
AI summary
A display device may include a plurality of pixels each including a light emitting element. A first scan line and a second scan line are disposed in each of the pixels. A data line is disposed in each of the pixels. A power line is disposed in each of the pixels. A reference voltage line is disposed in each of the pixels. A first transistor controls a current of the light emitting element. A second transistor is connected between the data line and a first gate electrode of the first transistor. A third transistor is connected between the reference voltage line and a first electrode of the first transistor. A fourth transistor is connected between the power line and a second electrode of the first transistor. The fourth transistor may be a transistor of a type different from that of the first to third transistors.