Pixel Circuit Layout for Smaller Area and Stable Signal Transmission
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Solution Overview
Problem
The increasing demand for high-resolution display devices necessitates a reduction in pixel area to accommodate more pixels within a given space.
Innovation Solution
A pixel design incorporating four or five transistors and two capacitors, including a first transistor with a gate connected to a first node, a second transistor that transmits a data signal, a third transistor that transmits a sustain voltage, a fourth transistor that transmits a power voltage, and a light-emitting element with a first terminal connected to a third node, along with a first and second capacitor, to optimize signal transmission and reduce pixel area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the number of transistors and capacitors in a pixel is reduced, then the pixel area is reduced, but the signal transmission reliability may deteriorate
Solution Approach 1:
The patent combines multiple functions into the first transistor by connecting its gate to the first node through the first capacitor, allowing it to participate in both threshold voltage compensation and data signal transmission. This merging of functions reduces the total component count while maintaining signal integrity and compensation capabilities.
Solution Approach 2:
The first transistor serves multiple purposes: it acts as a compensation transistor during the compensation period by storing threshold voltage on the first capacitor, and as a data transmission transistor during the addressing period by receiving data signals through the first node. This multi-functionality reduces the need for separate dedicated transistors for each function.
2Manufacturing precision
If the pixel area is reduced to increase resolution, then more pixels can be accommodated, but the complexity of circuit design increases
Solution Approach 1:
The pixel circuit is segmented into distinct operational periods (initialization, compensation, addressing, emission) with specific transistor activation patterns for each period. This temporal segmentation allows different transistors to be activated only when needed, simplifying the overall circuit control logic despite the reduced component count.
Solution Approach 2:
The circuit employs dynamic control where transistors are selectively activated and deactivated based on the operational period. The first transistor's gate connection to the first node creates a dynamic configuration that adapts between compensation and data transmission modes, reducing static complexity while maintaining functionality.
Data Source
AI summary
A pixel includes a first transistor including a gate connected to a first node, a first terminal connected to a second node, and a second terminal connected to a third node, a second transistor which transmits a data signal to the first node in response to a write gate signal, a third transistor which transmits a sustain voltage to the third node in response to a compensation gate signal, a fourth transistor which transmits a first power voltage to the second node in response to an emission signal, a first capacitor connected between the first node and the second node, a second capacitor connected between the second node and a power line which transmits the first power voltage, and a light-emitting element including a first terminal connected to the third node and a second terminal which receives a second power voltage.