Pixel Circuit Layout With Fewer Transistors for Higher Pixel Density
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Solution Overview
Problem
The challenge of integrating display device components into a narrow area with reduced pixel size and increased pixel density is hindered by limitations in minimizing the number of transistors required to meet design rules.
Innovation Solution
A pixel circuit design utilizing fewer transistors, including a light emitting element and specific transistors configured to perform various functions, such as applying driving current and initialization voltages, is implemented to achieve reduced pixel size and increased pixel density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the number of transistors is reduced to minimize pixel area, then pixel size is reduced and pixel density is increased, but the ability to integrate components meeting design rules is limited
Solution Approach 1:
The patent combines multiple transistor functions into fewer transistors. Specifically, the third transistor serves dual purposes: it acts as a compensation transistor during the compensation period and as an emission transistor during the emission period. This merging of functions reduces the total transistor count from the conventional six or more to five transistors, thereby reducing pixel area while maintaining the ability to meet design rules for component integration
Solution Approach 2:
The third transistor is designed with multi-functionality, serving as both a compensation transistor and an emission transistor depending on the operational period. During the compensation period, it functions as a compensation transistor to compensate for threshold voltage variations. During the emission period, it functions as an emission transistor to control light output. This universal design allows the pixel circuit to maintain full functionality with fewer transistors, resolving the contradiction between pixel area reduction and component integration capability
Data Source
AI summary
A pixel circuit includes a light emitting element, a first transistor that applies a driving current to the light emitting element, a second transistor that writes a data voltage in response to a write gate signal, a first capacitor connected to a control electrode of the first transistor, a second capacitor including a first electrode connected to the second transistor and a second electrode connected to the control electrode of the first transistor, a third transistor that diode-connects the first transistor in response to a compensation gate signal, a fourth transistor that applies an initialization voltage to the control electrode of the first transistor in response to a first initialization gate signal, and a fifth transistor that transmits the driving current to the light emitting element in response to an emission signal.