Pixel Circuit Source-Follower Compensation for Data Transmission Loss
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Solution Overview
Problem
Data transmission loss occurs in pixel circuits using source-follower compensation circuits, particularly due to the size of capacitors, which affects the accuracy of threshold voltage sensing and compensation.
Innovation Solution
The pixel circuit incorporates a source-follower compensation circuit that connects first and second capacitors between the gate electrode and the source electrode of the driving element, preventing data transmission loss by ensuring accurate threshold voltage sensing and compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a source-follower compensation circuit is used to sense threshold voltage, then threshold voltage sensing capability is improved, but data transmission loss occurs due to capacitor size limitations
Solution Approach 1:
The pixel circuit is divided into multiple functional blocks: a driving element for current drive, a source-follower compensation circuit for threshold voltage sensing, and a data transmission circuit. This segmentation allows each block to be optimized independently, with the compensation circuit using capacitors sized appropriately for accurate threshold voltage sensing without compromising data transmission integrity.
Solution Approach 2:
The source-follower compensation circuit acts as an intermediary between the data transmission path and the threshold voltage sensing path. It senses the threshold voltage of the driving element through a separate capacitor network, preventing direct interference between data voltage charging and threshold sensing operations, thereby eliminating data transmission loss while maintaining sensing accuracy.
2Reliability
If capacitor size is increased to prevent data transmission loss, then data transmission reliability is improved, but pixel circuit area increases
Solution Approach 1:
Different capacitor sizes are assigned to different functional requirements within the pixel circuit. The compensation capacitors are sized locally to achieve accurate threshold voltage sensing, while the data transmission path uses appropriately sized capacitors for reliable data writing. This local optimization prevents the need for uniformly large capacitors across the entire circuit, maintaining compact pixel area while ensuring both reliability and accuracy.
3Measurement precision
If data voltage is increased to prevent transmission loss, then data transmission accuracy is improved, but power consumption increases
Solution Approach 1:
The source-follower compensation circuit provides feedback on the threshold voltage of the driving element. By sensing and compensating for threshold voltage variations, the circuit ensures accurate data transmission at normal data voltage levels without requiring voltage increases. This feedback mechanism maintains transmission accuracy while preventing the power consumption increase that would result from higher data voltages.
Data Source
AI summary
Disclosed is a pixel circuit and a display device including the pixel circuit. The pixel circuit includes: a driving element; a light emitting element; a first capacitor connected between a second node and a fourth node; a second capacitor connected between a third node and the fourth node; a first switch element connected between the second node and a data line; a second switch element connected between the fourth node and a third voltage node; a third switch element connected between the third node and a fourth voltage node; a fourth switch element connected between the second node and the third voltage node; and a fifth switch element connected between the third node and an anode electrode of a light emitting element. In various embodiments, one or more the second third, fourth.