Pixel Circuit Layout for Fast Data Supply and Low Leakage
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Solution Overview
Problem
Pixels in display devices face challenges with leakage current when using P-type transistors as switching transistors, and insufficient data signal supply within a desired time when using N-type transistors.
Innovation Solution
The pixel design includes a light emitting element connected between two power lines, with specific transistors and capacitors configured to ensure stable data signal supply and minimize leakage current. This involves using a P-type transistor as a switching transistor connected between a data line and a node, and an N-type transistor connected between the node and another node, with specific timing and voltage control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a P-type transistor is used as a switching transistor that supplies data signals, then the transistor can be turned on easily, but leakage current increases
Solution Approach 1:
The switching transistor function is segmented into two separate transistors: a P-type transistor (second transistor) for easy switching operation and an N-type transistor (third transistor) for preventing leakage current. This division allows each transistor to specialize in one function, resolving the contradiction between ease of operation and leakage prevention.
Solution Approach 2:
The patent combines a P-type transistor and an N-type transistor to work together as a unified switching mechanism. The P-type transistor handles the switching action while the N-type transistor suppresses leakage current, merging the advantages of both transistor types to achieve both easy operation and low leakage.
2Object-generated harmful factors
If an N-type transistor is used as a switching transistor, then leakage current is minimized, but the data signal cannot be sufficiently supplied within the desired time
Solution Approach 1:
The switching function is segmented such that the N-type transistor (third transistor) is responsible only for leakage prevention, while the P-type transistor (second transistor) handles the data signal supply timing. This segmentation allows the P-type transistor to provide fast switching response without compromising the leakage prevention achieved by the N-type transistor.
Solution Approach 2:
The P-type transistor is turned on before the N-type transistor to establish the data signal supply path in advance. This preliminary action ensures that the data signal can be supplied within the desired time, while the N-type transistor subsequently activates to prevent leakage current during the signal transmission.
3Reliability
If both P-type and N-type transistors are used, then stable data signal supply and minimized leakage current are achieved, but device complexity increases
Solution Approach 1:
Both the P-type and N-type transistors are integrated into a unified pixel circuit design that serves multiple functions: the P-type transistor provides switching capability, the N-type transistor provides leakage prevention, and together they enable stable data signal supply. This multi-functional integration achieves high reliability while managing the added complexity through coordinated operation.
Data Source
AI summary
A pixel is disclosed that includes a light emitting element connected between a first power line and a second power line; a first transistor connected between the first power line and a first electrode of the light emitting element, and having a gate electrode connected to a first node; a second transistor connected between a data line and a second node, and having a gate electrode electrically connected to a first scan line; a third transistor connected between the second node and a third node, having a gate electrode electrically connected to a first light emission control line; and a first capacitor connected between the first node and the third node.